Abstract
A high velocity flow in a muffler induces secondary flow noises. The flow induced noise in a simple cavity type muffler with pulsating flow was studied experimentally, for simulating the automobile exhaust flow noise. The main sound source in a wide frequency range is thought pressure fluctuations on the wall that caused by the collision of the flow to the wall. In order to clarify the relation between pressure fluctuations and the pulsating flow, the phase difference of the flow in the cavity was obtained using the cross-correlation function. A time-frequency analysis was conducted considering the relation between the flow induced noise and the pressure fluctuation on the cavity inner the wall.
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